System for controlling construction machine

摘要

To provide a system for controlling a construction machine, which can be implemented inexpensively, can detect a failure in any of pressure sensors, controllers, an inverter device, and an electric motor for swing, and can secure safety and required workability for an operator.;Redundant hydraulic pressure sensors 20, 21 provide input to a first controller 11 for calculating a swing command, and a second controller 22 provided in an inverter device 13 for controlling an electric motor 16 for swing. The second controller 2 detects an abnormality in any of the hydraulic pressure sensors 20, 21 and the first controller 11 by a process for determining the validity of a swing command signal, and allows the swing operation to continue by using a signal from the second hydraulic pressure sensor 21 when determination is made based on the contents of the abnormality that the electric motor 16 for swing can operate normally.

主权项

1. A system for controlling a construction machine, comprising: operating members which are operated by an operator for operating a hydraulic actuator and an electric actuator; hydraulic operation signal generating units which output hydraulic operation signals in accordance with operation directions and operation amounts of the operating members for operating the hydraulic actuator; electric operation signal generating units which output electric operation signals in accordance with operation directions and operation amounts of the operating members for operating the electric actuator; electric control units which receive the electric operation signals and output control signals for the electric actuator in accordance with the electric operation signals; and an inverter device which receives the control signals and outputs a drive signal for the electric actuator in accordance with the control signals; wherein:
the inverter device calculates a status signal indicating a real driving status of the electric actuator based on a position signal of the electric actuator, determines whether a sign of each of the control signals coincides with a sign of the status signal or not, further determines whether the control signal is larger than the status signal or not, and stops the electric operation of the electric actuator when determination is made that the sign of the control signal does not coincide with the sign of the status signal or when determination is made that the status signal is larger than the control signal.